A 700-foot tanker carrying nearly 10 million gallons of oil ran onto a reef, the Coast Guard said. There was no immediate sign of a spill.

A pump room of the single-hull Star Connecticut took on 15 feet of water in the accident Tuesday night, but the flooding was controlled and the Coast Guard lowered pumps to the ship, said Lt. Kent Youel, a Coast Guard spokesman. Seas were calm.The ship ran aground a mile south of Barbers Point, about 10 miles west of Honolulu. The owner of the tanker, its origin and destination were not immediately known, nor was the cause of the accident, Youel said.

The skipper was trying to shift his load of 305,000 barrels of oil in an attempt to free the ship, he said. A Coast Guard cutter and a tugboat stood by.